BQ25611D: USB switch control with BQ25611D?

Chris P111

Part Number: BQ25611D
Other Parts Discussed in Thread: BQ25890, , TS3USB221

A related question to this post: https://e2e.ti.com/support/power-management/f/196/t/914715

If a USB switch is required, how would the switch be controlled to connect the DP/DM to the MCU after the detection process is complete? Is there an signal triggered by the charger to initiate the switch?

over 4 years ago

0 Ning T over 4 years ago

TI__Guru 57341 points

Hi,

BQ25611D does not have such signal output. You may use BQ25890 with DSEL pin which is almost pin-2-pin compatible.

Thanks,

Ning.

0 Kiwi Ji over 4 years ago in reply to Ning T

Prodigy 20 points

Hi Ning,

In the datasheet of BQ25611D, there's description about the DPDM detection that

"With I2C, after input source type detection is completed, an INT pulse is asserted to the host. in addition, the following register bits are updated".

Why not use this INT signal to inform MCU so that MCU can change to state of a GPIO to initiate the switch?

0 Ning T over 4 years ago in reply to Kiwi Ji

TI__Guru 57341 points

Hi,

Multiple conditions may generate INT pulses. Please refer to 9.3.8.2 Interrupt to Host ( INT) for the details.

Thanks,

Ning.

0 Kiwi Ji over 4 years ago in reply to Ning T

Prodigy 20 points

Hi Ning,

Is there any approach to use INT to realize the function that USB switch can be controlled by MCU?

Is it possible that MCU can distinguish the INT source by reading the register status before and after the DP/DM detection?

0 Ning T over 4 years ago in reply to Kiwi Ji

TI__Guru 57341 points

Hi,

It is possible.

With I2C, after input source type detection is completed, an INT pulse is asserted to the host. in addition, the IINDPM register bits are updated.

Thanks,

Ning.

0 Chris P111 over 4 years ago in reply to Ning T

Prodigy 40 points

Hi Ning,

Is there a reference schematic of the BQ25890 interfacing DSEL to a USB switch such as the TS3USB221?

It appears that the initial condition of the USB switch must connect DP/DM to the charger so that it may perform detection. Since DSEL only provides a transient low signal during detection, it cannot solely directly control the USB switch. Do you have any suggestions?

Thank you

Chris

0 Ning T over 4 years ago in reply to Chris P111

TI__Guru 57341 points

Chris,

Please refer to the BQ25890 EVM design at https://www.ti.com/lit/ug/sluuba2b/sluuba2b.pdf

Thanks,

Ning.

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BQ25611D: USB switch control with BQ25611D?